Add a special BuildVirtualCall that's going to be used for building calls to destruct...

Add a special BuildVirtualCall that's going to be used for building calls to destructors. This is needed because when compiling:

struct A {
	virtual ~A();
};

void f(A* a) {
	delete a;
}

A's deleting destructor should be called.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@87083 91177308-0d34-0410-b5e6-96231b3b80d8